CVE-2020-26116

http.client in Python 3.x before 3.5.10, 3.6.x before 3.6.12, 3.7.x before 3.7.9, and 3.8.x before 3.8.5 allows CRLF injection if the attacker controls the HTTP request method, as demonstrated by inserting CR and LF control characters in the first argument of HTTPConnection.request.

CVSS 3.1

7.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

EPSS

6.4% chance of exploitation in the next 30 days; higher than 93% of CVEs (scores of 2026-10-25)

CWE

CWE-74

Published

2020-09-27

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

Affected

• canonical:ubuntu_linux
• debian:debian_linux
• fedoraproject:fedora
• netapp:hci_storage_node
• netapp:solidfire
• opensuse:leap
• oracle:zfs_storage_appliance_kit
• python:python

References

• http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00027.html
• https://bugs.python.org/issue39603
• https://lists.debian.org/debian-lts-announce/2020/11/msg00032.html
• https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BW4GCLQISJCOEGQNIMVUZDQMIY6RR6CC/

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